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单词 penumbra
释义
penumbra
noun [ C or U ] physics specialized uk/pɪˈnʌm.brə/ us/pɪˈnʌm.brə/
(日食、月食等的)半影
the part of a shadow, especially one made by something blocking the sun, in which only part of the light is blocked
In a lunar eclipse, the outer shadow or penumbra is a zone where Earth blocks a portion of the sun's rays. 月食发生时,外侧的暗影或称半影是地球把部分太阳光挡住了的区域。
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